Assessment of Stress-Strain Behavior of Corroded Steel Reinforcement Using Digital Image Correlation (DIC)

2018 ◽  
Vol 46 (5) ◽  
pp. 20160487 ◽  
Author(s):  
Ranjitha Rajagopal ◽  
Sameer Sharma ◽  
Radhakrishna G. Pillai ◽  
Sankara J. Subramanian
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Steel Reinforcement ◽  
Image Correlation ◽  
Stress Strain ◽  
Strain Behavior ◽  
Assessment Of Stress

Full-Field Strain Behavior of Friction Stir-Welded Titanium Alloy by Digital Image Correlation

2014 ◽  
Vol 692 ◽  
pp. 490-496 ◽  
Author(s):  
Mamidala Ramulu ◽  
Trent Greenwell ◽  
Paul Labossiere
Keyword(s):  
Titanium Alloy ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Thin Sheet ◽  
Measurement Techniques ◽  
Image Correlation ◽  
Stress Strain ◽  
Full Field ◽  
Friction Stir ◽  
Strain Behavior

Experimental investigation is conducted to examine, evaluate, and characterize the fundamental elastic-plastic stress/strain response of friction stir-welded butt joints in thin-sheet, fine grain Ti-6Al-4V titanium alloy under normal tensile loading using traditional global stress-strain tensile testing and the full-field displacement measurement techniques of Digital Image Correlation (DIC). It was found that overall strength of friction stir-welded Ti-6Al-4V is comparable to the accepted values for mill-annealed Ti-6Al-4Valloy. Overall strain performance of friction stir-welded Ti-6Al-4V is roughly half that of the accepted values for pure mill-annealed Ti-6Al-4V. In addition, friction stir-welded Ti-6Al-4V demonstrates a consistent pattern of strain localization between the onset of yielding and ultimate failure.

scholarly journals Investigation on True Stress-Strain Curves of Flat and Corner Regions of Cold-Formed Section Using 3D Digital Image Correlation Method

2019 ◽  
Vol 2019 ◽  
pp. 1-18
Author(s):  
Bo Xu ◽  
Junwu Xia ◽  
Renwei Ma ◽  
Jian Wang ◽  
Xiaomiao Chen ◽  
...  
Keyword(s):  
Digital Image Correlation ◽  
Strain Hardening ◽  
Ultimate Strength ◽  
Digital Image ◽  
True Stress ◽  
Image Correlation ◽  
Stress Strain ◽  
Corner Region ◽  
Flat Region ◽  
3D Digital Image Correlation

The true stress-strain curve is the critical method to describe the practical material mechanical performance and the essential precondition to develop the advanced numerical simulation. Experimental, analytical, and numerical procedures were performed in present research to investigate the true stress-strain curves of flat and corner regions of the cold-formed channel section. The coupon tests with the 3D digital image correlation system were conducted on flat and corner specimens to directly obtain the true stress-strain curves. The experimental results indicate that the tensile secondary-hardening phenomenon at the plastic strain stage was observed in the true stress-strain curves of flat coupons, and initial strain hardening behavior was produced in that of corner coupons. Flat region exhibits a significant improvement of true ultimate strength compared to the engineering value. The stress status of the corner region is developed to ultimate strength at the early strain phase and exhibits a slight increase compared with the nominal values at the plastic phase. Cold-rolling action limits the ductility performance of the corner region, which highly restrains the tensile strain hardening at the plastic condition. Thus, the true yielding strength of the corner region is obviously higher, but the true ultimate strength is significantly lower than that of the flat region. Together with the optical measuring results, a trilinear model with two-stage strain hardening and a simplified trilinear models were established for describing the true stress-strain curves of flat and corner regions, respectively. The load-displacement curves from numerical simulations fit very well with those of coupon tests, which validate the reliability of the optic measurement and the dependability of the simplified constitutive models.

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